# MCQ On Digital Signal Processing: Q & A

MCQ On Digital Signal Processing Part 3. Multiple Choice Questions in Electronics Engineering related to Digital Signal Processing.

## MCQ On Digital Signal Processing

In the cascaded form of realization, the polynomials are factored into ??

a. a product of 1st-order and 2nd-order polynomials
b. a product of 2nd-order and 3rd-order polynomials
c. a sum of 1st-order and 2nd-order polynomials
d. a sum of 2nd-order and 3rd-order polynomials

The magnitude response of the Butterworth filter has ??

1) Flat stopband
2) Flat passband
3) Tapering passband
4) Tapering stopband

a. 1 and 2 are correct
b. 2 and 4 are correct
c. 2 and 3 are correct
d. All the four are correct

The frequency warping is referred to as ??

1) lower frequencies in analog domain expanded in the digital domain
2) lower frequencies in the digital domain expanded in the analog domain
3) non-linear mapping
4) compression of higher frequencies

a. 1, 3, and 4 are correct
b. 2 and 4 are correct
c. 2 and 3 are correct
d. All the four are correct

The transformation technique in which there is a one-to-one mapping from s-domain to z-domain is ??

a. Approximation of derivatives
b. Impulse invariance method
c. Bilinear transformation method
d. The backward difference for the derivative

The impulse invariant method is obtained by ??

a. Sampling the impulse response of an equivalent analog filter
b. Taking backward difference for the derivative
c. Mapping from s-domain to z-domain
d. Approximation of derivatives

### Electronic Engineering MCQ

The partial fraction of x2+1/x(x-1)2 is ??

a. 1/ (x-1) + 2/(x-1)2 – 1/x
b. 1/ (x-1) + 2/(x-1)2 – 3/x
c. 1/ (x-1) + 2/(x-1)2 – 3/x2
d. 1/ (x+1) + 2/(x+1)2 – 1/x

For a partial fraction method to be followed ??

1) The degree of the numerator must be more than the degree of the denominator.
2) The factors formed for partial fraction are a combination of Linear factors and Irreducible quadratic factors.
3) The degree of the numerator must be less than the degree of the denominator.
4) The factors formed for partial fraction are a combination of Linear factors and Square roots.

a. 1, 2, and 3 are correct
b. 1 and 2 are correct
c. 2 and 3 are correct
d. All four are correct

The factors formed for partial fraction are a combination of ??

1) Linear factors
3) Square roots
4) Cube roots

a. 1, 2, and 3 are correct
b. 1 and 2 are correct
c. 2 and 3 are correct
d. All the four are correct

The partial fraction method involves ??

a. Allotting coefficients
b. Dividing the numerator by denominator to get fractions
c. Dividing a single fraction into parts
d. None of the above

The condition for a system to be stable is ??

a. All poles of its transfer function lie on the left half of s-plane
b. All poles of its transfer function must be the right half of s-plane
c. All zeros of its transfer function must be the right half of s-plane
d. All zeros of its transfer function must be left half of s-plane

MCQ On Digital Signal Processing

The condition for a system to be causal is ??

a. All poles of its transfer function must be left half of s-plane
b. All poles of its transfer function must be the right half of s-plane
c. All zeros of its transfer function must be the right half of s-plane
d. All zeros of its transfer function must be left half of s-plane

Damping is the ability of a system ??

a. To support the oscillatory nature of the system’s transient response
b. To oppose the continuous nature of the system’s transient response
c. To oppose the oscillatory nature of the system’s transient response
d. To support the discrete nature of the system’s transient response

ROC does not have ??

a. zeros
b. poles
c. negative values

Overlap-Add Method Deals with principles that ??

a. The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length L + M – 1
b. The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length L + M
c. The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length 2L + M – 1
d. The linear convolution of a discrete-time signal of length L and a discrete-time signal of length M produces a discrete-time convolved result of length 2L + 2M – 1
d. positive values

The overlap save method is used to calculate ??

a. The discrete convolution between a sampled signal and a finite impulse response (FIR) filter
b. The discrete convolution between a sampled signal and an infinite impulse response (IIR) filter
c. The discrete convolution between a very long signal and a finite impulse response (FIR) filter
d. The discrete convolution between a very long signal and an infinite impulse response (IIR) filter

MCQ On Digital Signal Processing

Radix – 2 FFT algorithm performs the computation of DFT in ??

a. N/2Log2 N multiplications and 2Log2 N additions
b. N/2Log2 N multiplications and NLog2 N additions
c. Log2 N multiplications and N/2Log2 N additions
d. NLog2 N multiplications and N/2Log2 N additions

For the calculation of N- point DFT, Radix -2 FFT algorithm repeats ??

a. 2(N Log2 N) stages
b. (N Log2 N)2/2 stages
c. (N Log2 N)/2 stages
d. (N Log2(2 N))/2 stages

The circular convolution of two sequences in the time domain is equivalent to ??

a. Multiplication of DFTs of two sequences
b. Summation of DFTs of two sequences
c. Difference of DFTs of two sequences
d. Square of multiplication of DFTs of two sequences

A circular shift of an N point is equivalent to ??

a. Circular shift of its periodic extension and its vice versa
b. A linear shift of its periodic extension and its vice versa
c. A circular shift of its aperiodic extension and its vice versa
d. A linear shift of its aperiodic extension and its vice versa

Padding of zeros increases the frequency resolution ??

a. True
b. False

MCQ On Digital Signal Processing

The basic properties of DFT include??

1) Linearity
2) Periodicity
3) Circular symmetry
4) Summation

a. 1, 2, and 3 are correct
b. 1, 2, and 4 are correct
c. 1 and 3 are correct
d. All the four are correct

Causal systems are the systems in which ??

a. The output of the system depends on the present and the past inputs
b. The output of the system depends only on the present inputs
c. The output of the system depends only on the past inputs
d. The output of the system depends on the present input as well as the previous outputs

Time reversal of a discrete-time signal refers to ??

a. y[n] = x[-n+k]
b. y[n] = x[-n]
c. y[n] = x[-n-k]
d. y[n] = x[n-k]

Time shifting of discrete-time signal means ??

a. y[n] = x[n-k]
b. y[n] = x[-n-k]
c. y[n] = -x[n-k]
d. y[n] = x[n+k]

A signal x[n] is antisymmetric or odd when ??

a. x[-n] = x[n] • x[n]
b. x[n] = -x[n]
c. x[n] = [x[n]]2
d. x[-n] = -x[n]

MCQ On Digital Signal Processing

The principle of Gram-Schmidt Orthogonalization (GSO) states that any set of M energy signals can be expressed as ??

a. Summation of N orthonormal basis functions, where N ≤ M.
b. Linear combinations of N orthonormal basis functions, where N ≤ M
c. Product of logarithmic combinations of N orthonormal basis functions, where N ≤ M.
d. Product of inverse squares of N orthonormal basis functions, where N ≤ M.

The norm or length of a signal is given by ??

a. The square of the energy of the signal
b. The square root of the energy of the signal
c. The inverse of the energy of the signal
d. The cube root of the energy of the signal

The operations that may be performed on vectors in Euclidean Space are ??

1) Inner product, the distance between vectors
2) Norm of a vector, orthogonal vectors
3) Orthonormal functions
4) Vector division

a. 1, 2, and 3 are correct
b. 1 and 2 are correct
c. 1, 2, and 4 are correct
d. All the four are correct

The cost of the digital processors is cheaper because ??

a. Processor allows time-sharing among a number of signals
b. The hardware is cheaper
c. Require less maintenance
d. Less power consumption